Mask adapter



FIG. 1 is a front view of a mask adapter, showing the new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a front top right perspective view thereof;

FIG. 8 is a front top left perspective view thereof;

FIG. 9 is a rear top left perspective view thereof;

FIG. 10 is a rear top right perspective view thereof;

FIG. 11 is a front bottom right perspective view thereof;

FIG. 12 is a front bottom left perspective view thereof;

FIG. 13 is a rear bottom right perspective view thereof; and,

FIG. 14 is a rear bottom left perspective view thereof. 

CLAIM The ornamental design of a mask adapter, as shown and described. 